334 PROPAGATION THROUGH THE STANDARD ATMOSPHERE 
vertical polarization gives the higher field strength, greater the frequency the less difference in the 
while well within the diffraction region the field diffraction region between the two polarizations. 
strength is about the same. The last observation A comparison of Figures 9 and 12 shows the effect 
holds for all frequencies greater than 300 me, the of the height of the transmitting antenna. As the 
<i 
08 
Je) 2) 
v wo? 
b} 
4 
a 
s 
S a 
= = 
0 ee EEE = eee 
SO M@A okra 
Kilometers Ey Lip SS 
Frequency 3000Mc 
Horizontal Polarization ieee 
Antenna Height Ometers 
K= 4/3 
3 
i= 
& 
& 
Kilometers 1000 Ey > - - ~ SS 
150 
Frequency 3000 Mc 
Vertical Polarization 
Antenna Height 9 meters 
=4 
K=423 $00 
Figure 11. Contours of constant radio gain factor for vertical polarization on 3000 mc over sea water. 
7!00DB 
5 
4 
@ 
& 3 
3s 
5 2 
g 
Kilometers 
Frequency 100Mc 
Horizontal Polarization 
Antenna Height 152.4 meters 
K24/3 
FicurE 12. Contours of constant radio gain factor for horizontal polarization on 100 mc over sea water. 
